Ventilating-cowl.



No. 781,739. PATENTED FEB. 7, 1905. E. J. PREGOURT.

VENTILATING GOWL.

APPLICATION FILED MAY 13. 1904.

Patented February 7, 1905.

UNITED STATES PATENT OFFICE.

EDWARD J. PREGOURT, or PORTLAND, MAINE- VENTlLATlNG-COWL.

SPECIFICATION forming part of Letters Patent No. 781,739, dated February7, 1905.

Application filed May 13, 1904. Serial No. 207,886.

Be it lcnown that l, Enwam) J. Pnnconn'r, a citizen of the United Statesof America, and a resident of Portland, Cumberland county, State ofBlaine, have invented certain new and useful Improvements inVentilating-Lowls, of which the following is a specification.

My invention relates to a chimney-cowl; and the object of the inventionis to construct such a cowl in which no downdrafts can be created by themovement of the external air and in which such air movements will createtube with the ring which fits the cylindrical portion of the outer tube.Braces /1 are secured at their lower ends'to the ring and thence extendto the inner tube, when they are riveted or otherwise fastened, and theyterminate in the under side of the conef, to

the greatest possible vacuum, and thus help the drical in form andadapted to be inserted into the top of the chimney-flue. The upper end 6is formed into an inverted cone having on the upper edge thereof adeflecting-flange c. which inclines outwardl and downwardly, extendingboth inside and outside of the edge of the cone. \Vithin the conicalportion of the outer tube is the inner tube r! of smaller diameter thanthe outer tube, so that there is formed between them an annulardownwardtapering space. The upper end of the inner tube is preferablyslightly above the upper i edge of the cone 1), so that theupward-deflected air from the flange c will pass upward over the end ofthe inner tube. Just below the upper end of the inner tube is adeflectingtlange 1*, extending outward and downward substantiallyparallel with the flange 2.

The upper end of the cowl is formed of a conical hood f, located abovethe upper end of the cone 6, so as to allow a space for the escape ofthe smoke and gases.

For the purpose of handling and adjusting the parts I. connect the hoodand the inner which they are secured. Thus when the cone f is lifted outthe inner tube and the ring come with it, and the ring supports themembers in place with the lateral bearing, which the braces have on theinner edge of the flange c.

It will be seen that a cowl thus constructed will deflect the externalair upward from the flanged, from whence it will pass over the top ofthe inner tube, creating a vacuum there and in the annular space aroundthe inner tube. By the operation of the flange e downward currents areprevented from passing through the annular space.

1. The herein-described chimney cowl consisting of an outer tube havingits upper end formed into an inverted cone, an outwardly and downwardlyinclined llange on the upper edge of said cone, an inner tube withinsaid cone and separated therefrom, an outwardly and downwardly inclinedflange around the upper end of said inner tube substantially at the samelevel as the top of said cone, and a conical head above the upper end ofsaid cone.

2. The herein-described chimney-cowl consisting of an outer tube havingits upper end formed into an inverted cone, an outwardly and downwardlyinclined flange on the upper edge of said cone, an inner tube withinsaid cone and separated therefrom, an outwardly and downwardly inclinedflange around the upper end of said inner tube substantially at the samelevel as the top of said cone, a conical hood above the upper end ofsaid cone, a ring fitting the outer tube below said cone andsupporting-braces connecting the ring. the inner tube and the conicalhood.

EDlVAlil) J. PREUOURT.

\Vitnesses:

S. \V. Barns, A. II. NORTON.

